Not an X210 but you can get refurbished X201s for just about nothing. They suck for games but I don't really know how to improve them as a homework/development

Not an X210 but you can get refurbished X201s for just about nothing. They suck for games but I don't really know how to improve them as a homework/development computer (maybe EFI would be nice but that actually exists as part of the open source replacement firmware.)